Eruptions of the Yellowstone volcanic system have included the two largest volcanic eruptions in North America in the past few million years; the third largest was at Long Valley in California and produced the Bishop ash bed.
On the diesel Passat, the TDI badge stands for Turbocharged Direct Injection, which isn't really all that helpful as the gasoline-powered Passat is also turbocharged and also uses direct injection. Volkswagen attempts to clear this up by calling this Passat the Passat TDI Clean Diesel.
Available Audi MMI Navigation plus with MMI touch is an intuitive connection to almost every facet of the vehicle. It's the nerve center. You access what you want. A song, a call, directions to the in-laws. You decide. Just use the MMI controls, touch pad or voice control and you're set. It's the operating system designed with the driver in mind and it puts a range of functionality within your grasp. An inside look at all the MMI Navigation plus system benefits. Take a deep-dive look at the MMI touch system in the Audi A8.